1. C.P. SCHNORR; FFT-Hashing: An Efficient Cryptographic Hash Function; July 15, 1991 (This paper was presented at the rump session of the CRYPTO’91 Conference, Santa Barbara, August, 11–15, 1991)
2. DAEMEN-BOSSELAERS-GOVAERTS-VANDEWALLE: Announcement made at the rump session of the ASIACRYPT’ 91 Conference, Fujiyoshida, Japan, November 11–14, 1991)